I made a fascinating discovery today in the shower.

While brushing my teeth with my sonic toothbrush and humming “Wish I Could Stay” from the Once More, With Feeling soundtrack (for those of you who are not in the know, it’s the Buffy Musical), I hit a note that resonated beautifully with the whir of the dental device in my mouth.

That’s right, ladies and gents, my sonic toothbrush vibrates in the key of E.

Of course, not having perfect pitch and all, I had to find that note on my guitar. I’m not like Yvonne – she can hear a car honk and tell you that the horn is blaring an F#.